Boston Grammar School Sixth Form Entry Requirements

Boston Grammar School is a selective boys' academy in Boston, Lincolnshire whose sixth form is co-educational, which makes 16+ the only entry point open to a girl. Lincolnshire County Council records the sixth form published admission number as 70, against a stated maximum of 310 students and a current 16-to-18 roll of 214. There is no entrance test at 16+. Entry rests on GCSE grades and a telephone guidance meeting.

That last point is worth holding onto, because it is the opposite of how the school admits at eleven. Year 7 places are decided by a reasoning test that ranks candidates and takes the top quarter of the local cohort. Year 12 places are decided by a grade threshold and a conversation about the timetable. Two entirely different admissions machines sit inside one school, and almost every page written about Boston Grammar describes only the first one.

Can Girls Apply to Boston Grammar School's Sixth Form?

Yes, and this is the single most consequential fact on the page, because the public record obscures it. The school's own 11+ admissions page states the position in one sentence: "From 11-16, boys will be taught at Boston Grammar School and girls are welcomed into the co-educational Sixth Form." Lincolnshire County Council's determined record gives the school's gender designation as "Boys with mixed sixth form". The head of sixth form's published welcome describes the aim as providing "young men and women" with the opportunity to reach their potential.

Set against that, the Department for Education's performance service heads the school "Ages 11 to 18 Boys", and the ApplicaaOne sixth form directory records its Gender Type simply as "Boys" with no qualification at all. A parent who checks the two databases most likely to be surfaced by a search engine will conclude the sixth form is closed to their daughter. It is not.

The practical consequence is specific. A girl living in Boston who wants a grammar school education has two routes: the 11+ at Boston High School, the town's separate girls' grammar, or a sixth form application to Boston Grammar at 16. The two schools are entirely distinct institutions with different admission authorities, different sites and different policies, and nothing on this page carries over to the other. For a girl who did not sit the 11+, or who sat it and did not qualify, the Boston Grammar sixth form is the one door that is still open — and it opens on GCSE grades alone.

Why Two Official Sources Give Different GCSE Minimums

Search for the entry requirements and you will find two numbers presented with equal confidence. Lincolnshire County Council's record for the school says: "All applicants must achieve grades 5 to 9 in at least five GCSE subjects (or vocational equivalents), with at least a grade 6 in any subject to be studied at A Level (where the subject was taken at GCSE) and at least a grade 7 for Mathematics." The school's own sixth form entry requirements page says something different: "9-4 grades (or equivalent) in at least five GCSE subjects", plus "a minimum of grade 4 (or equivalent) in both GCSE English and Mathematics."

Those are not the same standard. The council's version sets the floor at grade 5 across five subjects. The school's version sets it at grade 4 across five subjects, with a separate grade 4 requirement in English and Maths specifically. A candidate holding five GCSEs at grade 4 meets the school's published bar and fails the council's. That is a full grade of difference on the threshold most applicants are closest to.

Neither source acknowledges the other, and none of the third-party guides that rank for this term has noticed. GrammarBound and our own 11+ guide both reproduce the council's grade 5 line; the school's per-course pages on its application portal reproduce the 9-4 line. We have not seen the school publish an explanation of the divergence.

The honest reading is this. The school administers its own sixth form admissions and its own entry requirements page is the more recently maintained document, so the 9-4 wording is what an admissions conversation is most likely to be conducted against. But the council's text is the determined arrangement, and a candidate sitting between the two — five GCSEs at grade 4, no grade 5 — should not assume the more generous number without asking. The right move is a direct question to the sixth form office before results day, not an assumption either way.

Which A Level Needs Which GCSE Grade?

The five-subject floor is rarely what stops an application. The subject rule is. Boston Grammar requires at least grade 6 at GCSE in any subject a student intends to continue to A level, wherever that subject exists as a GCSE course. On top of that, the school publishes four named exceptions, and one of them is more generous than the general rule rather than less.

Three of those deserve comment. Business Studies at grade 5 in Maths and English is the only published route into a facilitating-adjacent A level below the general grade 6 bar, which makes it the realistic option for a candidate whose profile is otherwise short. Economics is the trap in the other direction: it has no GCSE at most schools, so applicants assume there is no prerequisite, and the school sets one anyway at grade 6 in Mathematics. And the separate sciences require 6/6 from Double Science rather than a single grade, so a 6/5 profile qualifies a student for neither Chemistry nor Biology at A level even though the headline grade looks adequate.

The school's wording also covers subjects that simply did not exist at a candidate's previous school: "A minimum of a grade 6 (or equivalent) in a subject related to your A-level course choice, where GCSE courses do not readily exist or may not have existed in some feeder schools." That clause matters for external applicants more than internal ones, and it gives the sixth form room to accept a strong candidate whose school offered a narrow GCSE curriculum.

Is There a Test or Interview at 16+?

No. Boston Grammar publishes no 16+ entrance test, no admissions assessment and no formal interview. This should not be assumed for a Lincolnshire grammar: at Caistor Grammar School, an hour up the county, joining the sixth form mid-year requires two selection tests. Boston publishes nothing equivalent for either the September round or in-year entry.

What it publishes instead is a sequence, and it is unusual enough to set out in the school's own terms. An applicant first identifies the A-level courses they want and makes a provisional application for them. "Once we have received and acknowledged your application, we will arrange a telephone guidance meeting to discuss your choices, and we will then assume that you are a firm applicant and will cost you into our curriculum modelling."

Two things follow from that sentence. The telephone meeting is a guidance conversation, not a selection event — the school describes it as discussing choices, and the outcome is that the applicant is treated as firm. And the applicant's subject combination is used to plan the timetable, which is why the school attaches this warning: "If, for any reason, your chosen combination of subjects does not fit the timetable blocking for next year, we will contact you later in the year to discuss your aspirations and how we may be able to accommodate them."

In practice the constraint on entry is arithmetic rather than assessment. A candidate can hold every published grade and still find that Further Mathematics, Music and Art do not sit in compatible blocks. That risk falls hardest on applicants who choose an unusual combination and apply late, because the blocks are modelled from the applications the school already holds. Applying early is worth more at Boston than at a school that selects on merit, since early applicants are the ones the timetable is built around.

Compare that with the 11+, where the school states that test results are "rank ordered to select the top 25% of the local cohort, in keeping with the percentage intake targets across Lincolnshire's grammar schools." Our Boston Grammar School 11+ guide covers that route in full. At 16, no cohort ranking exists.

How Many Sixth Form Places Are There, and How Many Are Filled?

Lincolnshire County Council publishes two capacity figures for the sixth form, and they are not the same thing: "Sixth form published admission number 70. The Sixth Form normally accommodates a maximum of 310 students." The first is the number of external Year 12 entrants the school undertakes to admit. The second is the total roll it can hold across both sixth form years.

Against those, the council records the school's actual numbers: 661 pupils aged 11 to 16, and 214 aged 16 to 18.

Subtract 214 from 310 and roughly 96 places sit unused. The sixth form is running at about 69% of the size the county says it can hold. That arithmetic is ours, not the school's, and the two source figures may have been recorded in different terms — but the gap is large enough that it is unlikely to be a rounding artefact.

The reason is structural, not a judgement on the school. Boston Grammar takes 120 boys into Year 7 and holds 661 across Years 7 to 11, which is an average cohort of roughly 132. Even if every Year 11 pupil transferred, two years of internal students would fill barely 264 of 310 places, and not every Year 11 pupil transfers. A sixth form built to hold 310 in a school that admits 120 a year cannot fill itself from inside. It needs external applicants, which is precisely what the admission number of 70 is there to invite.

For an applicant this is the practical headline. The published admission number of 70 is a floor the school commits to, not a ceiling it is straining against, and the roll data suggests competition for external places is not the binding constraint. The binding constraints are the grade thresholds and the timetable blocks.

Does the 11+ Catchment Rule Apply in Year 12?

This is where readers most often import the wrong rule, so it is worth being exact. Boston Grammar has no catchment area at 11+. Qualification comes first, through the reasoning test; only if more qualified boys apply than there are places does the school rank them, and the ranking runs: looked after and previously looked after children who reached the required score, then children registered for Pupil Premium, then siblings of current pupils, then "straight line distance from home to school, priority given to those who live closest", with a lottery if distance cannot separate the last two candidates.

At 16+, the council's record says this: "Oversubscription criteria will apply in the event that there are more applications than places. If necessary, the oversubscription criteria for year 7 intake would apply in year 12 also."

Read that carefully. It is a conditional, not a catchment. The Year 7 criteria — including the distance tie-break — are held in reserve for a Year 12 round that receives more applications than places. On the roll figures above, that round has not arrived. There is also no qualifying test at 16+ to sit underneath the criteria, so the first limb of the Year 7 list, which is written around candidates "who have reached the required score", does not translate cleanly into a sixth form context in the first place.

The one priority that does operate every year is internal transfer. The council records that "Year 11 pupils from BGS have the right to transfer to the BGS Sixth Form, provided that they meet the published academic entry standards and that the school can accommodate their choice of subjects." That right is conditional on the same grades and the same timetable fit that external applicants face — it is a right of transfer, not a lower bar.

Key Dates in the Most Recently Published Cycle

These are the dates the school has published for the September 2026 intake. Treat them as the most recently published cycle rather than as a live timetable: the school reissues its sixth form application form each year, so a reader arriving after 3 September 2026 should ask the sixth form office directly for the equivalent dates for the following September.

The 20 August arrangement is the most useful thing the school publishes and it sits on a page almost nobody links to. In the school's own words: "GCSE results will be issued in school from 8:00am on Thursday 20th August. Results will be available in the main hall, where it will also be possible for students to enrol on their Sixth Form courses." The building is open from 8:00am until 2:00pm for results collection and for enrolment on A-level and BTEC courses.

Crucially, that desk is not reserved for the school's own Year 11. The school addresses external candidates directly: "For those collecting their results from other schools before enrolling on our Sixth Form courses, please ensure that you bring all results statements with you on the day." A student at another Boston secondary who opens an envelope at nine in the morning and decides that day to change plans can walk into Boston Grammar's main hall the same morning with their statement in hand. Very few sixth forms publish an arrangement that direct.

The formal application route is a short online form headed "APPLICATION FOR SIXTH FORM ENTRY 2026", run over three pages and estimated by the school at about eight minutes. It collects the applicant's details, current school and course choices, and it is what triggers the acknowledgement and the telephone guidance meeting described above. Applying through the form well before results day and confirming at the enrolment desk afterwards is the sequence the school's own process implies.

What Do the Sixth Form's Published Results Show?

Most guides to Boston Grammar's sixth form quote the school's marketing line about a wide range of A levels and stop. The school itself publishes harder numbers, and an applicant choosing between this sixth form and a Lincolnshire college deserves them.

For 2025, the school records an A-level average result of C-, an applied qualification average of Merit+, and 88% of students progressing to education or employment. That is a candid figure to publish and it is not what most readers expect from a school with "Grammar" in its name. It reflects what the roll data already showed: a sixth form that is substantially open at entry will produce a broader spread of outcomes than its own Year 7 intake would suggest.

For 2026, the school reports that in Biology, Chemistry, Maths, Further Maths, Business Studies, Economics, English Language, English Literature, French, German, Spanish, Art, Design Technology, Sport and PE, Music, History, Geography and RS — 18 subjects — more than 50% of grades were A* to C, and that two students each achieved four A* grades. Both statements are the school's own.

The key stage 4 picture underneath is consistent with that. The school publishes an Attainment 8 score of 53, an EBacc average point score of 4.93, 52.8% of pupils reaching grade 5 or above in English and Maths, and 60% entered for the EBacc. Roughly half the boys leaving Year 11 clear the grade 5 bar in both core subjects, which is another way of saying that the internal transfer pool is not uniformly strong and that a well-prepared external applicant is competitive.

The reasonable conclusion is not that the sixth form is weak but that it is genuinely comprehensive at entry while teaching a grammar school curriculum. For a student with strong GCSEs, that combination can be an advantage: small A-level sets, a full academic subject list, and less internal competition for teacher attention than a heavily oversubscribed sixth form offers.

Courses, Contact Time and Financial Support

The school states that it offers "20 different A levels, alongside BTECs in Music and Sport", complemented by the Extended Project Qualification, which it describes as "equivalent to 40% of an A level". Its listing on the ApplicaaOne sixth form directory carries 27 course entries, including Polish alongside German and Spanish — a genuinely unusual offer, and one that reflects Boston's population rather than a national trend.

On contact time the school publishes a specific claim: "We offer 10 hours of lessons with our specialist teachers per fortnight, for each subject: this is 11% more than the 9 hours offered by the majority of Sixth Forms and colleges." That is the school's own comparison, not an independent one, but the underlying figure of 10 hours per subject per fortnight is checkable and is worth putting to any college the family is also considering.

The school also commits to retake provision: "Where students are yet to attain a GCSE grade 4 in English or Maths, they will also receive the full amount of tuition recommended for retakes of those subjects." Read alongside the 9-4 entry wording, that is consistent with a sixth form designed to take students who arrive without a secure grade 4 in a core subject.

Two separate pots of money are frequently confused. The 16-19 Bursary Fund is the statutory one, administered by the school, and Boston lists what it can cover: transport to and from school, books and equipment, course-related trips, interview and university open day expenses, music tuition and participation in sport. In a district where students travel in from villages across the fens, the transport line is the one that matters most.

The scholarships are a different thing entirely and are not sixth form funding at all. The Stanley, Medlock and Cross scholarships are awarded to leavers going on to university. The school says "up to a dozen students are awarded one of the scholarships, which in recent times have amounted to £2,500 per year, for the first three years of study at university", and that 21 former pupils are currently supported. The Medlock is tied to three or more A grades at A level; the Cross is tied to a place at Durham. They do not reduce the cost of being in the sixth form, and no applicant should factor them into a Year 12 budget.

Frequently Asked Questions

Boston Grammar School's sixth form is easier to enter than its reputation implies and harder to plan for than most guides admit. The grade thresholds are modest and published, there is no test, and the school has room. The genuine risks are a subject grade one short of a 6, a combination that will not block, and — for girls in particular — the possibility of never applying at all because three of the four public records describing the school say "Boys". The official sources for all of this are the school's sixth form entry requirements page and Lincolnshire County Council's record for the school; both are worth reading before an application.